4 Customer Reviews

by Michael L. on 02/24/2015

"I bought this upgrade with an Echo 1 AK700 and I am very happy with the service I received and performance I am getting from this gun. Firstly, the work was done three days after placing my order....much faster than I expected. Secondly, the gearbox runs very smoothly so the shim job was outstanding. Thirdly, with the M120 spring I chrono'd the gun at 425 fps with 0.25 gram BBs. Thanks, Evike.

"I have a jg ak 47 which i completely messed up when i took the gear boxx out, i opened the gearbox and as i opened it everything shot out, i managed to find most parts, i think i found them all..... but i cant put it back together, i was also wondering if i could get a m170 spring instaleed if i payed for it, right now my gear box has is a High precision gear box with M120 Spring, reinforced piston and gears. Ultra high torque Turbo Motor, will it be a good upgrade, but mainly i want my gearbox back together and an m170 spring. How much would it cost?

by Joey S. on 02/15/2009

"i have a question, will this upgrade harm the internals of a stock ECHO 1 VMG-74? because i want to get this upgrade for fps and im getting the fire fox litium battery

Webmaster: UPgrade services won't harm your gun. But with a stronger spring, it will increase wear and tear. A stock VGM-74 probably already have a m120 spring inside. But most of the time, after our tech tunes the guns, they work better than stock. Because we put more time into the gun than the factory.

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